The series is based on the eponymous work by Lyudmila Martova. The story revolves around a young English literature teacher named Sofia. She works at a local university, dresses uniquely, and is passionate about philology, art, and history. One day, her peaceful life changes. Sofia discovers her detective abilities. Always known for her modesty and shyness, now Sonya is determined to find those responsible for the death of her neighbors, no matter what.